Is there any way to handle the error which would be return from the binding method in backend?

[L4zy-Sheep]

when I try to handle the error message to show on the window dialog,I found that the error message was wrap in the object and that I could not get the message field.
Why don't we only handle the error message on the catch callback method in backend and not an object like:

method()
 .then()
 .catch(error=>{
    console.log(error)    // output: some custom message
 })

This like the given example on the docs,but the error always an object and output like:Error: {"message":"some msg","cause":{},"kind":"RuntimeError"}